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// CODE SNIPPET

606.3 Duct and Plenum Insulation, Sealing and Testing

Green Construction Code 2012 of Maryland > 6 ENERGY CONSERVATION, EFFICIENCY AND CO2e EMISSION REDUCTION > 606 Building Mechanical Systems > 606.3 Duct and Plenum Insulation, Sealing and Testing
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Supply and return air ducts and plenums, air handlers and filter boxes shall be insulated and sealed in accordance with Section C403.2.7.1.1 of the International Energy Conservation Code. The exception in Section C403.2.7.1.1 shall not apply.

606.3.1 Duct Air Leakage Testing

Ductwork that is designed to operate at static pressures greater than 3 inches water column (747 Pa) and all ductwork located outdoors shall be leak-tested in accordance with the SMACNA HVAC Air Duct Leakage Test Manual. Representative sections totaling not less than 25 percent of the total installed duct area for the designated pressure class shall be tested. Positive pressure testing is acceptable for negative pressure ductwork. Duct systems with pressure ratings in excess of 3 inches water column (747 Pa) shall be identified on the construction documents. Duct leakage shall not exceed the rate determined in accordance with Equation 6-3.
F = CLP0.65(Equation 6-3)
where:
F= maximum leakage in cfm/100 ft2 duct surface area;
CL=4, duct leakage class, cfm/100 ft2 at 1 inch water column.
P= test pressure, which shall be equal to the design duct pressure class rating inches of water column.

Related Code Sections


606.3 ENERGY CONSERVATION, EFFICIENCY AND CO2e EMISSION REDUCTION, Duct and Plenum Insulation, Sealing and Testing
Supply and return air ducts and plenums, air handlers and filter boxes shall be insulated and sealed in accordance with Section C403.2.7.1.1 ...
Green Construction Code 2012 of Maryland > 6 ENERGY CONSERVATION, EFFICIENCY AND CO2e EMISSION REDUCTION > 606 Building Mechanical Systems > 606.3 Duct and Plenum Insulation, Sealing and Testing
C403.2.9 [CE] Commercial Energy Efficiency, Duct and Plenum Insulation and Sealing
gauge (747 Pa) shall be insulated and sealed in accordance with Section C403.2.9. In addition, ducts and plenums shall be leak tested in accordance ...
Energy Conservation Code 2015 of Maryland > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.2 Provisions Applicable to All Mechanical Systems (Mandatory) > C403.2.9 Duct and Plenum Insulation and Sealing
C403.11.2.3 [CE] Commercial Energy Efficiency, High-Pressure Duct Systems (Mandatory)
Ducts and plenums designed to operate at static pressures equal to or greater than 3 inches water gauge (747 Pa) shall be insulated and sealed ...
Energy Conservation Code 2018 of Maryland > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.11 Construction of HVAC System Elements (Mandatory) > C403.11.2 Duct Construction (Mandatory) > C403.11.2.3 High-Pressure Duct Systems (Mandatory)
Section 602 Duct Systems, Plenums
Pipe and duct insulation contained within plenums, including insulation adhesives, shall have a flame spread index of not more ...
Mechanical Code 2018 of Maryland > 6 Duct Systems > 602 Plenums
Section 604 Duct Systems, Insulation
as internal insulation and exposed to the airstream in ducts shall be shown to be durable when tested in accordance with UL 181. Exposed internal ...
Mechanical Code 2018 of Maryland > 6 Duct Systems > 604 Insulation
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